JPS5935683Y2 - Connection structure of assembled reinforcing bar columns with different diameters - Google Patents

Description

[Detailed description of the invention] This invention simplifies the connection work and strengthens the structure of the entire column when connecting columns with different diameters in the assembled reinforced columns used in various reinforced concrete structures. This invention relates to the provision of a new rational and efficient connection structure that improves performance.

It is well known that prefabricated reinforced steel columns and beams are used as reinforcing steel structures for various reinforced concrete structures, and these assembled steel columns and beams all have hoops attached to the main bars of the columns and beams. It has a shape that is constructed as a cylindrical skeleton by fixing the muscles in a single or double spiral.

At this time, the assembled reinforcing bar column is integrated in the vertical direction,
In particular, when the upper and lower connecting columns have different diameters, conventional connection methods and structures have the following problems.

In other words, in conventional reinforcing bar construction methods and prefabricated reinforcing bar construction methods, when the diameters of the upper and lower columns are different, the connection structure is such that the lower large diameter Either bend and fix the end of the main column reinforcement of the side column, or provide a column joint at a predetermined position above the joint, and connect the bent column main reinforcement and the column main reinforcement of the upper small-diameter side column with various types of joints. Either the main reinforcement of the upper small-diameter side pillar is parallel to the main reinforcement of the lower large-diameter side pillar in a concave manner, and the two are connected indirectly by some mechanical connection means. It has an integrated structure.

In the former method, bending a part of the column main reinforcement itself increases the number of processing steps, requires time and effort, and has poor processing accuracy, and there is also a joint part in the middle of the assembled reinforcing column. There is a risk that the reinforcing performance of the assembled reinforcing bar members will be reduced in that part, and the latter method uses the adhesion force between the reinforcing bars and concrete at the joint part to anchor parallel main bars in columns of large and small diameters. Therefore, the length required to anchor the parallel column reinforcements is quite long, and it is necessary to allow for loss of steel material, which poses problems in terms of construction and economics, and the work itself is difficult. It also has drawbacks such as not being easy.

The present invention solves these problems with the conventional connection structure, by providing an upper column main bar fixing plate in advance at the joint part of the lower assembly reinforcing bar column side and at a position near it, and attaching the upper column main bar fixing plate to this fixing plate. The column main bars in the reinforcing bar column are fixed by nut fixing means, which simplifies the connection work and improves the structural reinforcement performance over the entire length of the assembled reinforcing bar column.
However, it is also advantageous in terms of cost, and its feature is that the lower assembly reinforcing bar is connected to the upper assembly reinforcing bar having a smaller diameter than the lower assembly reinforcing bar column. At the same time, a fixing plate for the main beam reinforcement is fixed to the main reinforcement of the steel column located at the joint part of the column, and a fixing plate for the main reinforcement of the column is fixed to the fixing plate for the beam main reinforcement or the main reinforcement of the lower assembly reinforcing column, and the fixing plate for the main reinforcement of the column is The main reinforcement of the upper assembly reinforcing bar column is fixed to the plate with a fixing nut.

The present invention will be described in detail below based on the illustrated embodiments. Fig. 1 shows an example of a conventional connection part, Fig. 2 shows an embodiment of the connection structure according to the invention, and Fig. 3 shows an assembled frame 1 according to the invention. As an example, FIGS. 4 and 5 both show modified embodiments of the connection structure according to the present invention. First, the outline of the conventional connection structure shown in FIG. 1 will be explained. This figure shows a method in which the main bars of assembled reinforcing bars are bent and connected. In the figure, A1 is the lower assembled reinforcing bar column, A2 is the upper assembled reinforcing bar column, B, B is the assembled reinforcing bar column A1. C shows the assembled reinforcing beams perpendicular to A2, and C indicates these reinforcing columns A1. A joint part for connecting A2 and reinforcing bar beams B and B is shown, and these assembled reinforcing bar columns A1. A2 and assembled reinforcing beams B and B each have a plurality of main reinforcements 1 and 5 arranged in parallel,
This is a known structure in which hoop reinforcements 1a and 5a are wound around the outer periphery of these 1 group of main reinforcements and 5 groups of main reinforcements in a jingle spiral or double spiral shape and are fixed. In the case of the illustrated example, it is a beam main reinforcement anchoring plate installed on the main reinforcement 1 side of the lower assembled reinforcing bar column A1, and the assembled reinforcing beam B is connected by this anchoring plate 4.

This is for attaching and fixing the main reinforcing bars 5 on the B side, and since the structure for attaching and fixing is already known in the art and there are various methods, explanations are omitted in the illustrated example.

In this figure, if the lower assembled reinforcing bar column A1 has a large diameter and the upper assembled reinforcing bar column A2 has a small diameter, each main bar 1 of the lower assembled reinforcing bar A1 is bent at the bent part 1' at the joint part C position as shown in the figure. The main reinforcing bars 1 of the upper assembled reinforcing bar column A2 are made to have the same diameter and concentricity with each other, and a column joint is provided at a predetermined position above the joint part C, and the upper and lower main reinforcing bars 1 are connected to each other by, for example, a lap joint. , gas pressure welding joints, cold one-fit joints, and other joint means are used to integrate the continuous joints.

In this connection structure, as mentioned earlier, the presence of such a joint part in the middle of the assembled reinforcing bar column weakens the structural reinforcement effect over the entire length of the assembled reinforcing bar column. However, in terms of structural strength, there are problems such as an increase in cost by seeking the same reinforcement effect as the assembled reinforcing bar column that does not have other joints, and in actual construction, it is difficult to use main reinforcement 1. The disadvantages of bending are that it requires more man-hours and increases costs, reduces processing accuracy, complicates the work itself, and requires special parts for the joint. There is.

As an alternative to this method, in the example shown in Figures II and III, a small-diameter upper assembly reinforcing bar A2 is used for the large-diameter lower assembly reinforcing bar A□, and its small diameter is used within the joint section C. The upper main reinforcing bars 1 on the small diameter side are parallel to the lower main reinforcing bars 1 on the large diameter side in a concave manner, and the upper main reinforcing bars 1 on the small diameter side are connected with a mechanical connecting member 6 such as a U-bolt, or by welding. This is a connection structure in which the beam main reinforcement fixing plate 4 described above is used for fixation.

In this method, the upper and lower main reinforcements 1, 1 are integrated by the adhesion force between the concrete and the reinforcing bars at the joint part C, so the anchorage length for the parallel superposition of the upper and lower main reinforcements 1, 1 is quite large. For example, in the case of using 38φ reinforcing bars, the length of the anchorage is approximately 16m.Since the main reinforcing bars used in this type of assembled reinforcing bar columns are often large-diameter reinforcing bars, the length of the anchorage is long. This means that there will be a lot of steel loss, which will cause problems in terms of construction and economy, and the work will be troublesome.

On the other hand, in the present invention, as illustrated in FIG. In the case of A2 and assembled reinforcing beams B and H, each of the large diameter lower assembled reinforcing bars A1 at the joint part C, in the illustrated example, is installed at every two of the four main bars 1, and above and below the joint part C. The fixing plates 3, 3 for the four main bars 1 in the small-diameter upper assembly reinforcing bar column A2 are respectively fixed to the fixing plates 4゜4 on the two opposing sides of the beam main bar fixing plates 4, 4 sets installed. , these fixing plates 3, 3 will be provided with two plates each on the upper and lower beam main bar fixing plates 4, 4, for a total of four fixing plates 3 on one side, and of course, the four main bars 1 of the upper assembly reinforcing bar column A2 will be installed. The main reinforcing bars 1 are inserted through each of these fixing plates 3 (L3a).

Of course, it is also possible to fix four or more fixing plates for fixing the upper main reinforcement.

On the other hand, each column reinforcement 1 of the upper assembly reinforcing bar column A2 is inserted through the insertion holes 3a, 3a of each fixing plate 3, 3, and is secured by tightening with a locking nut 2.2 as shown in the figure. For this purpose, the main bar 1 of the upper assembly reinforcing bar column A2 is
It is necessary to use threaded reinforcing bars, or to thread only the lower ends of the fixing plates 3, 3. However, threaded reinforcing bars have been used conventionally, and some parts may be threaded. This can also be easily processed when producing assembled reinforcing bars at a factory.

Further, it is not necessary to add any special structure to the anchoring plate 3 and the locking nut 2, and it is sufficient that they can exhibit the effect of anchoring the main reinforcing bars 1, 1 after concrete is poured.

Figure 3 shows an example of the assembled reinforced steel frame according to the embodiment in Figure 2, where bl is an underground beam of the foundation, b2
indicates the second floor beam, b3 indicates the third floor beam, and b4 indicates the fourth floor beam, and each of these floor beams b2 to b4 are similar to the prefabricated reinforcing bar beam B shown previously, and al, a2. a3. A4 shows each floor column using the prefabricated reinforcing bar A shown earlier, but in the illustrated example, the large diameter prefabricated reinforcing bar A1 is used for up to the second floor, and the small diameter prefabricated reinforcing bar A2 is used for the third floor and above. , the connection structure of the present invention is used at the joint between the assembled reinforcing bar column a2 on the second floor and the assembled reinforcing bar column b3 on the third floor, that is, the joint section C, and E in the figure is the connection structure according to the present invention shown in Fig. 2. The connection structure part is shown.

Other assembled reinforcing bar columns a1 with the same diameter. Between a2 and a3 and 34, the conventional connection method at the joint section will be used.

4 and 5 are modified embodiments of the connection structure of the present invention. In the embodiment of FIG. 4, all of the four main reinforcements 1 of the upper and lower columns are are connected by a fixing plate 3 and a locking nut 2.An example is shown in which the connection structure of the present invention is applied to one or more upper and lower column main bars 1, 1. Among the main reinforcements 1, 1, the three upper and lower column main reinforcements 1, 1 are connected using the fixing plate 3 locking nut 2 of the present invention, and the remaining one upper and lower column main reinforcement 1, 1 is connected to the large diameter side. This figure shows a lower assembly reinforcing bar column A1 that is placed concentrically with one main bar 1 and connected continuously using a joint method.

That is, among the four main reinforcements 1 in the lower assembly reinforcing bar column A1, one column reinforcement 1 at the lower left corner in the drawing is attached to the upper assembly reinforcement column A1.
Align one column bar 1 at the same position in 2 concentrically, and this column bar 1, 1 is raised above the joint part C at a predetermined position,
For example, the remaining three main bars 1 of the upper assembled reinforcing bar column A2 are directly connected and integrated using a coupling member 7 such as a coupler, and the remaining three main bars 1 of the upper assembled reinforcing bar column A2 are connected to the beam main bar fixing plate 4 of the corresponding lower assembled reinforcing bar column A2.
4. Fixing plates for column main reinforcement fixed to 4 respectively 3. 3
．． 3)2. 2. This type of connection structure also applies to embodiment 1 of the present invention.
It is possible.

In the figure, 8 is the continuous connection between the column reinforcements 1 and 1 by the joint member 7, so the column reinforcement 1 in the upper assembly reinforcement column A2 is connected at this part.
The hoop muscle is shown wrapped around the periphery of the group.

Furthermore, in the modified embodiment shown in FIG. 5, instead of installing the above-mentioned fixing plate 3 for the column main reinforcement on the beam main bar fixing plate 4 in the joint part C, Fixing plates 3, which are approximately horizontal in the illustrated example, are fixed to the reinforcing bars 1, and the column reinforcing bars 1 at corresponding positions in the upper assembly reinforcing bar column A2, which is inserted into the joint part C in a depressed manner, are respectively tightened with locking nuts. 2, and the column reinforcement fixing plate 3 can also be provided on the column main reinforcement 1 side of the lower assembly reinforcing bar column A1 in this way.

In addition, in each of the above embodiments, the anchoring plate 3 for the column main reinforcement is as follows:
When providing the fixing plate 4 for the beam main reinforcement, instead of attaching a separate fixing plate 3, it is also possible to provide it integrally as a part of the fixing plate 4 itself. It is also clear that deformed steel sheets can be effectively utilized.

The present invention is as described above, and in connecting the small diameter upper assembled reinforcing bar column A2 to the large diameter lower assembled reinforcing bar column A1, each column main reinforcement 1 in the upper assembled reinforcing bar column A2 is connected to the lower assembled reinforcing bar column. The connection can be made very easily by inserting it into the insertion hole 3a of the beam main bar fixing plate 4 in A1 or the fixing plate 3 provided on each main bar 1 and fixing it with the lock nut 2, and no special adjustment or construction is required. Any number of people can easily and reliably perform the connection work quickly and without the need for a person, does not require the use of special auxiliary members, and has a simple and clear structure. This can bring about the following effects.

In other words, since it is basically unnecessary to set joints on assembled reinforced columns, it is possible to expect a sufficient structural reinforcement effect of assembled reinforced steel members over the entire length of the column, and prevent deterioration or weakening of structural performance at joints. There is no risk of this happening, there is no need to make joints during construction, and there is no need to perform shear reinforcing work on the joints afterwards, so construction costs can be reduced significantly.

Furthermore, when fabricating assembled reinforcing bars in a factory, there is no need to bend the reinforcing bars, and there is no need to weld the upper assembled reinforcing bars to the lower assembled reinforcing bars A can be reduced to

Furthermore, since the main reinforcement of the column in the upper assembly reinforcing bar column A2 is anchored by the stop nut 2, the length of the above-mentioned anchorage can be shortened and steel loss can be reduced. By adjusting the tightening of the stop nut 2, the column Erecting accuracy can be easily ensured, and it is excellent in contributing to streamlining the work of fixing assembled reinforcing bars with different diameters on the top and bottom, and improving the strength and performance of assembled reinforcing members over the entire length.

[Brief explanation of drawings]

Fig. 1 is a side view including a partial cross-sectional plane illustrating a conventional connection structure, Fig. 2 is a side view and a cross-sectional plan view of an embodiment of the connection structure of the present invention, and Fig. 3 is an assembled reinforcing bar frame using the same connection structure. FIGS. 4 and 5, which illustrate one example, are side views and a cross-sectional plan view of a modified embodiment of the present invention. A1... Lower assembled reinforcing bar column, A2... Upper assembled reinforcing bar column, B...... Assembled reinforcing beam, 1...
...Column main reinforcement, 1a... Hoop reinforcement, 2...
- Locking nut, 3...Fixing plate for column main reinforcement, 4...
...Beam main reinforcement anchor plate.

Claims (1)

[Scope of utility model registration request] A lower assembled reinforcing bar column is connected to an upper assembled reinforcing bar column having a smaller diameter than the lower assembled reinforcing bar column, and a beam main reinforcement fixing plate is fixed to the main reinforcement of the steel column located at the joint part of the lower assembled reinforcing bar column, and the beam A different diameter assembly characterized in that a column main reinforcement fixing plate is fixed to a main bar fixing plate or the main bar of the lower assembly reinforcing bar column, and the main bar of the upper assembly reinforcing bar column is fixed to the column main bar fixing plate with a fixing nut. Reinforced column connection structure.